fix: Fixed region name in account setup

[henriquesantanati]

What this PR does / why we need it:

Fix region name for this page

Which issue(s) this PR fixes:

Fixes #1254

Quality checks

• My content adheres to the style guidelines
• [-] I ran make test module="<module>" it was successful (see https://github.com/aws-samples/eks-workshop-v2/blob/main/docs/automated_tests.md)
• The PR has meaningful title and description of the changes that will be included in the workshop release notes

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

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